I am about to buy a yj and it has some mods. The biggest mod and it concerns me for safety is the rear suspension. It is 1/4 elliptical sprung with triangular 4 link. I am told this causes jeeps to flip over unless the front suspension is set up to match the rear? How do you match your suspension? The front has a 2.5 soa bds. The last thing I want is an unsafe rig especially with my kid in the back.

Is this going to be a daily driver or a trail only rig?
If trail only, are you planning on driving it to the trails or trailering it?
One last thing, if you are asking these questions then the Jeep is way over your head.